It looks like your message cut off. Do you want a brief explanation of the MP4 format, or were you asking how MP4 relates to a specific tool or HTML element (e.g., that span tag)? Which of these should I cover:
- What MP4 is (format, codecs, use cases)
- How to convert to/from MP4 (best settings, tools)
- Embedding/serving MP4 in HTML (video tag, accessibility, streaming)
I’ll proceed with the first option (what MP4 is) unless you tell me otherwise.
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